EON Stimulator
The Eon and Eon Mini stimulators, both St. Jude products, are two specific spinal stimulators that have been found by the FDA and the company itself to have defective components. The FDA issued a warning letter to St. Jude Medical, resulting in the company's announcement that there were weld failures present within the internal batteries of their units.

Physicians and Patients who may have been implanted with defective stimulators are being notified individually by St. Jude Medical. Since the problem surfaced in 2011, over 300 heat-related complaints have been filed on behalf of carriers of defective units and several lawsuits have been filed.